GetElementPtr instructions default to having no overflow.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@76222 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/VMCore/Instructions.cpp b/lib/VMCore/Instructions.cpp
index 6a259fb..a5e082c 100644
--- a/lib/VMCore/Instructions.cpp
+++ b/lib/VMCore/Instructions.cpp
@@ -1022,6 +1022,9 @@
OL[i+1] = Idx[i];
setName(Name);
+
+ // GetElementPtr instructions have undefined results on overflow by default.
+ setHasNoPointerOverflow(true);
}
void GetElementPtrInst::init(Value *Ptr, Value *Idx, const std::string &Name) {
@@ -1031,6 +1034,9 @@
OL[1] = Idx;
setName(Name);
+
+ // GetElementPtr instructions have undefined results on overflow by default.
+ setHasNoPointerOverflow(true);
}
GetElementPtrInst::GetElementPtrInst(const GetElementPtrInst &GEPI)
@@ -1042,6 +1048,9 @@
Use *GEPIOL = GEPI.OperandList;
for (unsigned i = 0, E = NumOperands; i != E; ++i)
OL[i] = GEPIOL[i];
+
+ // Transfor the hasNoPointerOverflow() value from the original GEPI.
+ setHasNoPointerOverflow(GEPI.hasNoPointerOverflow());
}
GetElementPtrInst::GetElementPtrInst(Value *Ptr, Value *Idx,